United States · 1991–2020

Best time to visit
Waterloo.

October leads for comfortable weather in Waterloo: typically 23°C by day, 6.9°C at night, with 87 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high23°C

Typical low6.9°C

Rain in October87 mm

Comfort

October

October · May · September

73climate match

Beach

June

June · July · August

68climate match

Outdoors

October

October · April · November

74climate match

The weakest month is January, scoring 5 against October’s 73 — days reach only 9.8°C, 14° below the 24°C the score treats as ideal, and nights drop to -2.4°C.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

59.8° / -2.4°

Feb

1412.4° / -1.4°

Mar

3317° / 2.4°

Apr

6222.2° / 6.9°

May

7026.2° / 12.4°

Jun

6429.7° / 16.7°

Jul

5231.3° / 18.9°

Aug

5331.6° / 18.1°

Sep

7028.5° / 13.7°

Oct

7323° / 6.9°

Nov

3716.8° / 2.3°

Dec

510.8° / -1.7°

Monthly climate evidence for Waterloo — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	9.8°C	-2.4°C	133 mm	8.9	10 h 03	5	Good coverage
February	12.4°C	-1.4°C	130 mm	7.9	10 h 52	14	Good coverage
March	17°C	2.4°C	151 mm	8.5	11 h 52	33	Good coverage
April	22.2°C	6.9°C	130 mm	7.7	13 h 01	62	Good coverage
May	26.2°C	12.4°C	135 mm	7.9	13 h 58	70	Good coverage
June	29.7°C	16.7°C	109 mm	7.7	14 h 29	64	Good coverage
July	31.3°C	18.9°C	120 mm	8.9	14 h 17	52	Good coverage
August	31.6°C	18.1°C	124 mm	7.3	13 h 28	53	Good coverage
September	28.5°C	13.7°C	111 mm	5.5	12 h 21	70	Good coverage
October	23°C	6.9°C	87 mm	5.5	11 h 15	73	Good coverage
November	16.8°C	2.3°C	119 mm	7.7	10 h 17	37	Good coverage
December	10.8°C	-1.7°C	167 mm	10.2	9 h 49	5	Good coverage

Records at IUKA, 1977–2012
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.9°C5 Jan 2004	-24.4°C21 Jan 1985	151 mm23 Jan 1999	348 mm2002 · driest 8 mm in 1986	33
February	27.8°C28 Feb 1981	-18.9°C5 Feb 1996	163 mm19 Feb 1991	314 mm1991 · driest 20 mm in 1978	32
March	30.0°C20 Mar 1982	-13.9°C3 Mar 1980	117 mm10 Mar 1992	342 mm1980 · driest 51 mm in 2007	32
April	34.4°C22 Apr 1987	-6.1°C4 Apr 1987	112 mm5 Apr 2011	350 mm1983 · driest 5 mm in 2012	34
May	34.4°C1 May 1987	0.0°C4 May 2004	145 mm26 May 1991	562 mm1991 · driest 15 mm in 2007	34
June	38.9°C30 Jun 2012	4.4°C1 Jun 1984	104 mm10 Jun 1994	295 mm1997 · driest 0 mm in 1988	34
July	40.6°C31 Jul 1986	11.1°C14 Jul 2001	107 mm17 Jul 2010	249 mm1994 · driest 24 mm in 1990	33
August	41.1°C16 Aug 2007	6.1°C30 Aug 1986	181 mm30 Aug 2005	284 mm1992 · driest 9 mm in 1999	32
September	37.8°C4 Sep 1990	1.1°C27 Sep 2001	161 mm22 Sep 2003	315 mm2002 · driest 6 mm in 1999	33
October	33.3°C1 Oct 1986	-5.0°C29 Oct 2001	85 mm13 Oct 2001	237 mm1984 · driest 0 mm in 2000	31
November	30.6°C1 Nov 1984	-10.0°C6 Nov 1991	119 mm13 Nov 2008	292 mm1986 · driest 3 mm in 2011	33
December	25.0°C15 Dec 1984	-21.1°C23 Dec 1989	203 mm26 Dec 1982	452 mm1982 · driest 24 mm in 1980	33

Typical days per month at IUKA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	21	4	<1
February	<1	0	18	4	<1
March	3	0	12	5	<1
April	10	<1	4	4	0
May	20	5	<1	4	0
June	26	16	0	4	0
July	30	23	0	4	0
August	30	23	0	3	0
September	24	11	0	3	0
October	12	<1	4	3	0
November	2	0	13	4	<1
December	0	0	21	6	<1

How often, not how much — every day in IUKA’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	3%	28%	13%	33%	6.2–12.5°C
February	11%	30%	15%	37%	9.3–14.9°C
March	27%	28%	15%	32%	14.7–19.5°C
April	53%	27%	13%	31%	20.1–24.9°C
May	67%	27%	13%	30%	24.5–28.2°C
June	73%	26%	11%	30%	28.0–32.2°C
July	73%	27%	11%	28%	30.0–33.7°C
August	79%	22%	10%	20%	30.1–34.6°C
September	78%	20%	9%	18%	26.8–30.9°C
October	63%	19%	8%	20%	21.5–24.7°C
November	27%	27%	14%	32%	14.4–20.1°C
December	4%	32%	18%	37%	8.6–13.3°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1978Each stripe is one year’s mean temperature against the 26-year average. Warmest: 1990. Coolest: 1997.2006

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4096497
NOAA station: USC00224455 · IUKA
Station distance: 21 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 34.92°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from IUKA is what differs

Iuka→Belmont→Cherokee→Burnsville→Tishomingo→Golden→

Or put two places side by side: Waterloo vs Iuka

Best time to visitWaterloo.

October

June

October

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Waterloo.

The whole year,
without the guesswork.

Nearby, measured,
and named.